85805637139 has 2 divisors, whose sum is σ = 85805637140. Its totient is φ = 85805637138.

The previous prime is 85805637067. The next prime is 85805637143. The reversal of 85805637139 is 93173650858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85805637139 - 2²⁵ = 85772082707 is a prime.

It is a super-2 number, since 2×85805637139² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85805637139.

It is not a weakly prime, because it can be changed into another prime (85805637199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42902818569 + 42902818570.

It is an arithmetic number, because the mean of its divisors is an integer number (42902818570).

Almost surely, 2^85805637139 is an apocalyptic number.

85805637139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85805637139 is an equidigital number, since it uses as much as digits as its factorization.

85805637139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 85805637139 in words is "eighty-five billion, eight hundred five million, six hundred thirty-seven thousand, one hundred thirty-nine".